Europe's plan to lend money to Spain to heal some of its banks may not work because the government and the country's lenders will in effect be propping each other up, Nobel Prize-winning economist Joseph Stiglitz said.

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If requested in full by Madrid, the bailout would add another 10 percent to Spain's debt-to-gross domestic product ratio, which was already expected to hit nearly 80 percent at the end of 2012, up from 68.5 at the end of 2011.

With Spanish banks, including the Bank of Spain, the main buyers of new Spanish debt in 2011 - according to a report by the Spanish central bank - the risk is that the government may have to ask for help from the same institutions that it is now planning to help.

"It's voodoo economics," Stiglitz said in an interview on Friday, before the weekend deal to help Spain and its banks was sealed. "It is not going to work and it's not working."